My heater blower for 85 LJ70 suddenly stopped working. I did checked the breaker & tested & it's working fine. I removed The heater blower to see if contacts are the problem but there are okey. I tested the blower directly in a 12v battery also works fine. the blower does not respond at all in any level of the switch. Any body knows if there is a relay for this truck or any other things I shld do. Thanks